Emma and Jane had an equal number of stamps at first. Emma used
15 of her stamps and Jane used
110 of her stamps. They used 30 stamps altogether. How many stamps did Jane have in the end?
| |
Emma |
Jane |
| Before |
5x2 =
10 u |
10x1 =
10 u |
| Change |
- 1x2 =
- 2 u |
- 1x1 =
- 1 u |
| After |
4x2 =
8 u |
9x1 =
9 u |
The number of stamps that Emma and Jane each had at first is the same. Make the number of stamps that Emma and Jane each had at first the same. LCM of 5 and 10 is 10.
Number of stamps that Emma and Jane used
= 2 u + 1 u
= 3 u
3 u = 30
1 u = 30 ÷ 3 = 10
Number of stamps that Jane had in the end
= 9 u
= 9 x 10
= 90
Answer(s): 90
